AP Stats Chapters

_____________________ is the use of a regression line for prediction outside the interval of x values used to obtain the line.

The ___________________ measures the percent of the variability in the response variable that is accounted for by the least-squares regression line.

• coefficient of determination

• coefficient of relaxation

Which of the following definitions are true...

• Points with high leverage in regression have much larger or much smaller x values than the other points in the data set.

• An outlier in regression is a point that does not follow the pattern of the data and has a large residual.

• An influential point in regression is any point that, if removed, substantially changes the slope, y intercept, correlation, coefficient of determination, or standard deviation of the residuals.

• All of the above

What equation for the LSRL would be most reasonable for this data?

• A student's heartrate after the walk will be 1.58 times what their resting heartrate is. 

• If a student's resting heartrate increases 1 bpm, their heartrate after the walk is predicted to decrease 26.16 bpm

• If a student's resting heartrate increases 1 bpm, their heartrate after the walk is predicted to increase 1.58 bpm

• A student's heartrate before the walk is predicted to be 26.16 bpm lower than after the walk. 

What type of correlation exists between the number of people that go to the pool and the temperature outside.

• positive

• negative

• no correlation

• unknown

The scores on a statistics exam had a mean of 81 and a standard deviation of 9. One student was absent on the test day, and his score wasn't included in the calculation. If his score of 84 is added to the distribution of scores, what would happen to the mean and standard deviation?

• mean will increase, standard deviation will increase

• mean will increase, standard deviation will decrease

• mean will increase, standard deviation will stay the same

• mean will decrease, standard will decrease 

If a distribution is skewed to the right with no outliers, 

• mean<median

• mean>median

• mean=median

• can not determine

Which of the following statements about this distribution is not correct?

• The histogram is skew right.

• The median is less than the $20.

• The IQR is $35.

• The mean is greater then the median. 

True or false: The IQR is a resistant measure of spread.

• True 

• False